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EP0996718B1 - Methode de constitution d'une bibliotheque par rearrangement d'adn - Google Patents

Methode de constitution d'une bibliotheque par rearrangement d'adn Download PDF

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Publication number
EP0996718B1
EP0996718B1 EP98907910A EP98907910A EP0996718B1 EP 0996718 B1 EP0996718 B1 EP 0996718B1 EP 98907910 A EP98907910 A EP 98907910A EP 98907910 A EP98907910 A EP 98907910A EP 0996718 B1 EP0996718 B1 EP 0996718B1
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Prior art keywords
polypeptides
polypeptide
population
dna templates
interest
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EP98907910A
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German (de)
English (en)
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EP0996718A1 (fr
Inventor
Torben Vedel Borchert
Titus Kretzschmar
Joel R. Cherry
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Novozymes AS
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Novozymes AS
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
    • C12N15/1034—Isolating an individual clone by screening libraries
    • C12N15/1093—General methods of preparing gene libraries, not provided for in other subgroups
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
    • C12N15/102—Mutagenizing nucleic acids
    • C12N15/1027—Mutagenizing nucleic acids by DNA shuffling, e.g. RSR, STEP, RPR
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14—Hydrolases (3)
    • C12N9/16—Hydrolases (3) acting on ester bonds (3.1)
    • C12N9/18—Carboxylic ester hydrolases (3.1.1)
    • C12N9/20—Triglyceride splitting, e.g. by means of lipase
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14—Hydrolases (3)
    • C12N9/24—Hydrolases (3) acting on glycosyl compounds (3.2)
    • C12N9/2402—Hydrolases (3) acting on glycosyl compounds (3.2) hydrolysing O- and S- glycosyl compounds (3.2.1)
    • C12N9/2405—Glucanases
    • C12N9/2408—Glucanases acting on alpha -1,4-glucosidic bonds
    • C12N9/2411—Amylases
    • C12N9/2414—Alpha-amylase (3.2.1.1.)
    • C12N9/2417—Alpha-amylase (3.2.1.1.) from microbiological source
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14—Hydrolases (3)
    • C12N9/48—Hydrolases (3) acting on peptide bonds (3.4)
    • C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
    • C12N9/52—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from bacteria or Archaea
    • C12N9/54—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from bacteria or Archaea bacteria being Bacillus

Definitions

  • the present invention relates to optimizing DNA sequences in order to (a) improve the properties of a protein of interest by artificial generation of genetic diversity of genes encoding proteins having a biological activity of interest by the use of the so-called gene- or DNA shuffling technique to create a large library of "genes", expressing said library of genes in a suitable expression system and screening the expressed proteins in respect of specific characteristics to determine such proteins exhibiting desired properties or (b) improve the properties of regulatory elements such as promoters or terminators by generation of a library of these elements, transforming suitable hosts therewith in operable conjunction with a structural gene, expressing said structural gene and screening for desirable properties in the regulatory element.
  • novel polypeptide variants and mutants such as novel modified enzymes with altered characteristics, e.g. specific activity, substrate specificity, thermal, pH and salt stability, pH-optimum, pI, K m , V max etc., has successfully been performed to obtain polypeptides with improved properties.
  • Pompon et al., (1989), Gene 83, p. 15-24 describes a method for shuffling gene domains of mammalian cytochrome P-450 by in vivo recombination of partially homologous sequences in Saccharomyces cerevisiae by transforming Saccharomyces cere visiae with a linearized plasmid with filled-in ends, and a DNA fragment being partially homologous to the ends of said plasmid.
  • polypeptide variants are prepared by shuffling different nucleotide sequences of homologous DNA sequences by in vivo recombination using plasmid DNA as template.
  • Hybrid DNA sequences are produced by forming a circular vector comprising a replication sequence, a first DNA sequence encoding the amino-terminal portion of the hybrid polypeptide, a second DNA sequence encoding the carboxy-terminal portion of said hybrid polypeptide.
  • the circular vector is transformed into a rec positive microorganism in which the circular vector is amplified. This results in recombination of said circular vector mediated by the naturally occurring recombination mechanism of the rec positive microorganism, which include prokaryotes such as Bacillus and E . coli, and eukaryotes such as Saccharomyces cerevisiae.
  • WO 95/22625 relates to a method for shuffling of homologous DNA sequences.
  • An important step in the method described in WO 95/22625 is to cleave the homologous template double-stranded polynucleotide into random fragments of a desired size followed by homologously reassembling of the fragments into full-length genes.
  • a further reference of interest is WO 95/17413 describing a method of gene or DNA shuffling by recombination of specific DNA sequences - so-called design elements (DE) - either by recombination of synthesized double-stranded fragments or recombination of PCR generated sequences to produce so-called functional elements (FE) comprising at least two of the design elements.
  • DE design elements
  • FE functional elements
  • WO 95/17413 therefore also entails the disadvantage that the diversity generated is relatively limited. Furthermore the methods described are time consuming, expensive, and not suited for automation.
  • the present invention relates to a method of constructing a library of recombined polynucleotides from a starting population of different single or double stranded parental DNA templates encoding polypeptides of the same functionality having homologies ranging over a broad spectrum from less than 15% to more than 80%, wherein each DNA template is at least 70% homologous to at least one other DNA template in the starting population, and wherein said DNA templates are subjected to a gene shuffling procedure to generate shuffled mutants of said population.
  • the gene shuffling procedure to be used according to the invention can be any suitable method such as those described above or a procedure as described in our co-pending patent application WO 98/41623 , filed on the same date, and outlined below.
  • the invention relates to a method of identifying a polypeptide of interest exhibiting an improved property, wherein a library of recombined polynucleotides, encoding polypeptides of interest and produced by a method as defined in the preceeding aspect is cloned into an appropriate vector, said vector is transformed into a suitable host, the host is grown to express said polypeptides, and wherein the expressed polypeptides are screened in a suitable assay to identify and select the polypeptide exhibiting the improved property.
  • the invention in a final aspect relates to a method for producing a polypeptide of interest identified by a method as defined in the preceeding aspect, comprising the steps of growing a host comprising a polynucleotide encoding said polypeptide, to express said polypeptide; and recovering as well as purifying the polypeptide.
  • “Shuffling” means recombination of nucleotide sequence fragment(s) between two or more polynucleotides resulting in output polynucleotides (i.e. polynucleotides having been subjected to a shuffling cycle) having a number of nucleotide fragments exchanged, in comparison to the input polynucleotides (i.e. starting point polynucleotides).
  • homology is determined as the degree of identity between two sequences indicating a derivation of the first sequence from the second.
  • the homology may suitably be determined by means of computer programs known in the art, such as GAP provided in the GCG program package (Program Manual for the Wisconsin Package, Version 8, August 1994, Genetics Computer Group, 575 Science Drive, Madison, Wisconsin, USA 53711)( Needleman, S.B. and Wunsch, C.D., (1970), Journal of Molecular Biology, 48, 443-453 ).
  • homologous means that one single-stranded nucleic acid sequence may hybridize to a complementary single-stranded nucleic acid sequence. The degree of hybridization may depend on a number of factors including the amount of identity between the sequences and the hybridization conditions such as temperature and salt concentration as discussed later ( vide infra).
  • heterologous If two or more DNA sequences mutually exhibit a degree of identity which is less than above specified, they are in the present context said to be “heterologous”.
  • Hybridization Suitable experimental conditions for determining if two or more DNA sequences of interest do hybridize or not is herein defined as hybridization at low stringency as described in detail below.
  • Molecules to which the oligonucleotide probe hybridizes under these conditions are detected using a x-ray film or a phosphoimager.
  • primer The term “primer” used herein especially in connection with a PCR reaction is an oligonucleotide (especially a “PCR-primer”) defined and constructed according to general standard specification known in the art ("PCR A practical approach” IRL Press, (1991 )).
  • flanking The term “flanking” used herein in connection with DNA sequences comprised in a PCR-fragment means the outermost partial sequences of the PCR-fragment, both in the 5' and 3' ends of the PCR fragment.
  • Polypeptide Polymers of amino acids sometimes referred to as protein. The sequence of amino acids determines the folded conformation that the polypeptide assumes, and this in turn determines biological properties such as activity. Some polypeptides consist of a single polypeptide chain (monomeric), whilst other comprise several associated polypeptides (multimeric). All enzymes and antibodies are polypeptides.
  • Enzyme A protein capable of catalysing chemical reactions.
  • specific types of enzymes are a) hydrolases including amylases, cellulases and other carbohydrases, proteases, and lipases, b) oxidoreductases, c) Ligases, d) Lyases, e) Isomerases, f) Transferases, etc.
  • enzymes used in detergents such as proteases, lipases, cellulases, amylases, etc.
  • the object of the present invention is thus to provide a method whereby it is possible to shuffle components of genes encoding polypeptides of the same functionality, but having only low homologies.
  • hybrids are generated in which sequence parts from very heterologous starting genes can be found. These retrieved starting genes would have never been shuffled without having the intermediate species in the starting population because of a too large "sequence space" distance.
  • the present invention relates in its first aspect to a method of constructing a library of recombined polynucleotides from a starting population of different single or double stranded parental DNA templates encoding polypeptides of the same functionality having homologies ranging over a broad spectrum from less than 15% to more than 80%, wherein each DNA template is at least 70% homologous to at least one other DNA template in the starting population, and wherein said DNA templates are subjected to a gene shuffling procedure to generate shuffled mutants of said population.
  • parental DNA templates representing homologies ranging from less than 45%, 40%, 35%, 30%, 25%, 20%, or 15% to more than 80%, 85%, 90%, 95%, or 99%.
  • At least one identification sequence is identified and primers constructed to anneal thereto. These sequences can be located anywhere on the genes.
  • At leasts two identification sequences are identified. These sequences can be located at any distance from each other, but it is preferred that they are located as far as possible from each other on the genes.
  • said identification sequences may correspond to an amino acid sequence of from 4 to 8 amino acid residues, which sequence is highly conserved among the peptides encoded by the collection of starting single or double stranded parental DNA templates, preferably from 5 to 7 amino acid residues.
  • the identification sequences are located a distance apart corresponding to the average size of the genes in said collection with a variation of up to 40%. The longer apart the sequences are the larger a part of the gene is shuffled.
  • method provides for the construction of a library of recombined homologous polynucleotides from a number of different starting single or double stranded parental DNA templates and primers by induced template shifts during an in vitro polynucleotide synthesis using a polymerase, whereby
  • the gene shuffling is performed by the method described in our co-filed application WO 98/41623 whereby conserved regions of heterologous DNA sequences are identified for shuffling of heterologous DNA sequences of interest having at least one conserved region comprising the following steps:
  • the peptide is a protease, especially a subtilase.
  • subtilase identification sequences may be located around the aspartic acid in position 32, or the histidine in position 64 and the active serine in position 221 of subtilisin BPN'.
  • the peptide is an amylase, especially an ⁇ -amylase.
  • identification sequences may be located around the Asp in position 100 and the Asp in position 328 of B.licheniformis ⁇ -amylase.
  • the identification sequences may preferentially be located around Tyr in position 8 and around Ser in position 476.
  • the peptide is a lipase, or a cellulase.
  • lipases suitable identification sequences may be found by using the lipase alignment shown in A. Svendsen et al. (1995): Biochemical properties of cloned lipases from the Pseudomonas family, Biochimica et Biophysica Acta 1259 9-17 . Examples could be around the Pro in position 10 or around the His in position 285 (using P. glumae lipase numbering).
  • suitable identification sequences may be the conserved region ""Thr Arg Tyr Trp Asp Cys Cys Lys Pro/Thr" and the conserved region ""Trp Arg Phe/Tyr Asp Trp Phe".
  • PCT DK97/00216 See in particular in example 3 of ( PCT DK97/00216 ).
  • suitable identification sequences may be the conserved regions "DGGTYDIY” and "EGYQSSG"
  • DDGTYDIY conserved regions
  • EGYQSSG conserved regions
  • PCR primers are constructed according to the standard descriptions in the art. Normally they are 10-75 base-pairs (bp) long. However, for the specific embodiment using random or semi-random primers the length may be substantially longer as indicated above.
  • PCR-reaction performed according to the invention are performed according to standard protocols known in the art.
  • isolation of PCR fragment is intended to cover as broad as simply an aliquot containing the PCR fragment. However preferably the PCR fragment is isolated to an extend which remove surplus of primers, nucleotides templates etc..
  • the DNA fragment(s) is(are) prepared under conditions resulting in a low, medium or high random mutagenesis frequency.
  • the DNA sequence(s) (comprising the DNA fragment(s)) may be prepared by a standard PCR amplification method ( US 4,683,202 or Saiki et al., (1988), Science 239, 487 - 491 ).
  • a medium or high mutagenesis frequency may be obtained by performing the PCR amplification under conditions which increase the misincorporation of nucleotides, for instance as described by Deshler, (1992), GATA 9(4), 103-106 ; Leung et al., (1989), Technique, Vol. 1, No. 1, 11-15 .
  • telomere amplification i.e. according to this embodiment also DNA fragment mutation
  • a mutagenesis step using a suitable physical or chemical mutagenizing agent, e.g., one which induces transitions, transversions, inversions, scrambling, deletions, and/or insertions.
  • Expression of the recombinant protein encoded by the shuffled sequence in step vi) of the second and third aspect of the present invention may be performed by use of standard expression vectors and corresponding expression systems known in the art.
  • positive polypeptide variants means resulting polypeptide variants possessing functional properties which has been improved in comparison to the polypeptides producible from the corresponding input DNA sequences.
  • improved properties can be as different as e.g. enhance or lowered biological activity, increased wash performance, thermostability, oxidation stability, substrate specificity, antibiotic resistance etc.
  • the screening method to be used for identifying positive variants depend on which property of the polypeptide in question it is desired to change, and in what direction the change is desired.
  • PCT-DK96/00322 describes a screening assay for lipases having an improved wash performance in washing detergents.
  • An embodiment of the invention comprise screening or selection of recombinant protein(s), wherein the desired biological activity is performance in dish-wash or laundry detergents.
  • suitable dish-wash or laundry detergents are disclosed in PCT-DK96/00322 and WO 95/30011 .
  • the polypeptide may be subjected to another cycle.
  • At least one shuffling cycle is a backcrossing cycle with the initially used DNA fragment, which may be the wild-type DNA fragment. This eliminates non-essential mutations. Non-essential mutations may also be eliminated by using wild-type DNA fragments as the initially, used input DNA material.
  • polypeptides having biological activity such as insulin, ACTH, glucagon, somatostatin, somatotropin, thymosin, parathyroid hormone, pituary hormones, somatomedin, erythropoietin, luteinizing hormone, chorionic gonadotropin, hypothalamic releasing factors, antidiuretic hormones, thyroid stimulating hormone, relaxin, interferon, thrombopoeitin (TPO) and prolactin.
  • biological activity such as insulin, ACTH, glucagon, somatostatin, somatotropin, thymosin, parathyroid hormone, pituary hormones, somatomedin, erythropoietin, luteinizing hormone, chorionic gonadotropin, hypothalamic releasing factors, antidiuretic hormones, thyroid stimulating hormone, relaxin, interferon, thrombopoeitin (TPO) and prolactin.
  • TPO thrombopo
  • the starting parental DNA sequences may be any DNA sequences including wild-type DNA sequences, DNA sequences encoding variants or mutants, or modifications thereof, such as extended or elongated DNA sequences, and may also be the outcome of DNA sequences having been subjected to one or more cycles of shuffling (i.e. output DNA sequences) according to the method of the invention or any other method (e.g. any of the methods described in the prior art section), or synthetic sequences or otherwise mutagenized sequences.
  • shuffling i.e. output DNA sequences
  • the resulting recombined polynucleotides i.e. shuffled DNA sequences
  • silent exchanges are contemplated (i.e. nucleotide exchange which does not result in changes in the amino acid sequence).
  • a population of subtilase-encoding genes or parts of such genes are generated through isolation or by synthesis. Sources for the genes may be as described in Siezen et al. Protein Engineering 4 1991 719-737 .
  • the population may also comprise genes encoding the pre-pro subtilases as defined in GenBank entries A13050_1, D26542, A22550, Swiss-Prot entry SUBT_BACAM P00782, and PD498 (Patent Application No. WO 96/34963 ) with homologies(similarities) ranging from 32% to 64% as calculated by the MegAlign software from DNASTAR Inc. (WI 53715, USA) using the Clustal Method.
  • the substrates used in the shuffling reaction are represented by linear double stranded DNA generated by PCR amplification using primers located at/directed towards the ends of the DNA to be shuffled.
  • the primers can conveniently be constructed using the sequences surrounding the histidine in pos 64 of subtilisin BPN' and the serine in position 221 of subtilisin BPN'.
  • the template for this PCR can either be plasmids containing cloned protease genes or chromosomal DNA extracted from bacterial strains e.g. protease secreting bacteria isolated from soil.
  • the substrate will typically be generated separately for all the templates and pooled before the shuffling reaction.
  • the substrates are fragmented e.g. by DNAse I treatment or shearing by sonication as described in WO 95/22625 .
  • the generated fragments are separated according to size by agarose gel electrophoresis and generated fragment of the desired size, e.g. from 10 to 50 bp. or from 30 to 100 bp, or from 50 to 150 bp, or from 100 to 200 bp are purified from the gel.
  • fragments are reassembled by PCR as described in WO95/22625 .
  • correctly assembled DNA fragments are amplified by subjecting the product from the assembly reaction to another PCR including two primers able to anneal to the ends of correctly assembled fragments.
  • the resulting fragments can be cloned into suitable expression plasmids, and subsequently screened for a specific property, such as thermostability using assays well known in the art.

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Claims (12)

  1. Méthode pour construire une banque de polynucléotides recombinés à partir d'une population de départ de différentes matrices d'ADN simple ou double brin parentales codant des polypeptides de la même fonctionnalité ayant des homologies s'étalant sur un large spectre allant de moins de 15 % jusqu'à plus de 80 %, dans laquelle chaque matrice d'ADN a au moins 70 % d'homologie avec au moins une autre matrice d'ADN de la population de départ, et dans laquelle lesdites matrices d'ADN sont soumises à une procédé de réarrangement de gènes pour générer des mutants réarrangés de ladite population.
  2. Méthode selon la revendication 1, dans laquelle les mutants réarrangés générés et la population de matrices d'ADN de départ sont soumis à un ou plusieurs procédés de réarrangement de gènes supplémentaires, dans laquelle les mutants réarrangés générés sont recombinés entre eux et avec les matrices d'ADN de la population de départ.
  3. Méthode selon la revendication 1 ou 2, dans laquelle la population de départ de matrices d'ADN simple ou double brin parentales ainsi que les mutants réarrangés générés codent des polypeptides d'intérêt ; de préférence les polypeptides d'intérêt sont des enzymes ; de manière plus préférée, les polypeptides d'intérêt sont : a) des hydrolases incluant des amylases, des cellulases et d'autres carbohydrases, des protéases, et des lipases, b) des oxydoréductases, c) des ligases, d) des lyases, e) des isomérases, ou f) des transférases ; de manière encore plus préférée, les polypeptides d'intérêt sont des protéases, des amylases, des lipases, des cellulases ou des xylanases.
  4. Méthode selon la revendication 3, dans laquelle les mutants réarrangés générés sont clonés dans un vecteur approprié.
  5. Méthode selon la revendication 3 ou 4, dans laquelle le vecteur est transformé dans un hôte approprié.
  6. Méthode selon la revendication 5, dans laquelle l'hôte est cultivé pour exprimer lesdits polypeptides, et dans laquelle les polypeptides exprimés sont criblés avec un test adapté pour identifier et sélectionner un polypeptide montrant une propriété améliorée ; et facultativement, récupérer ledit polypeptide sélectionné.
  7. Méthode selon l'une quelconque des revendications 1-6, dans laquelle une ou plusieurs région(s) conservée(s) est/sont identifiée(s) dans au moins deux matrices d'ADN comprises dans la population de départ, et dans laquelle ledit procédé de réarrangement est effectué en utilisant au moins deux ensembles d'amorces de PCR dirigées contre ladite ou lesdites région(s) conservée(s).
  8. Méthode selon la revendication 7, dans laquelle la population de départ de matrices d'ADN simple ou double brin parentales ainsi que les mutants réarrangés générés codent une subtilase, et dans laquelle la ou les région(s) conservée(s) sont localisée(s) autour de l'histidine en position 64 et de la sérine active en position 221 de la subtilisine BPN'.
  9. Méthode selon la revendication 7, dans laquelle la population de départ de matrices d'ADN simple ou double brin parentales ainsi que les mutants réarrangés générés codent une alpha-amylase, et dans laquelle la ou les région(s) conservée(s) sont localisée(s) autour de la Tyr en position 8, de l'Asp en position 100, de l'Asp en position 328 et/ou de la Ser en position 476 de l'alpha-amylase de Bacillus licheniformis.
  10. Méthode selon la revendication 7, dans laquelle la population de départ de matrices d'ADN simple ou double brin parentales ainsi que les mutants réarrangés générés codent une lipase, et dans laquelle la ou les région(s) conservée(s) sont localisée(s) autour de la Pro en position 10 et autour de l'His en position 285 de la lipase de Pseudomonas glumae.
  11. Méthode pour identifier un polypeptide d'intérêt montrant une propriété améliorée, dans laquelle une banque de polynucléotides recombinés codant des polypeptides d'intérêt et produite par une méthode telle que définie dans l'une quelconque des revendications 1 à 10 est clonée dans un vecteur approprié, ledit vecteur est transformé dans un hôte approprié, l'hôte est cultivé pour exprimer lesdits polypeptides, et dans laquelle les polypeptides exprimés sont criblés avec un test adapté pour identifier et sélectionner le polypeptide montrant la propriété améliorée.
  12. Méthode pour produire un polypeptide d'intérêt identifié par une méthode telle que définie dans la revendication 11, comprenant les étapes consistant à :
    a) cultiver un hôte comprenant un polynucléotide codant ledit polypeptide pour exprimer ledit polypeptide ; et
    b) récupérer et purifier le polypeptide.
EP98907910A 1997-03-18 1998-03-18 Methode de constitution d'une bibliotheque par rearrangement d'adn Expired - Lifetime EP0996718B1 (fr)

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DK30697 1997-03-18
DK30697 1997-03-18
DK43397 1997-04-17
DK43397 1997-04-17
DK62397 1997-05-30
DK62397 1997-05-30
PCT/DK1998/000103 WO1998041622A1 (fr) 1997-03-18 1998-03-18 Methode de constitution d'une bibliotheque par rearrangement d'adn

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EP0996718B1 true EP0996718B1 (fr) 2008-12-24

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DE69840382D1 (de) 2009-02-05
ATE418608T1 (de) 2009-01-15
DK0996718T3 (da) 2009-04-06
EP0996718A1 (fr) 2000-05-03
WO1998041622A1 (fr) 1998-09-24

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